Move requirements generation in playground to playground worker

[aliabd]

To make it simpler to save the requirements with the generated code in the db, moves the requirements generation to happen on the playground worker alongside the code generation. Will merge since changes on the playground worker are already live.

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
	Storybook	ready!	Storybook preview
🦄	Changes	detecting...

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/873af77011d669e36c4deaa147ce70bfe6ad8a37/gradio-5.8.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@873af77011d669e36c4deaa147ce70bfe6ad8a37#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/873af77011d669e36c4deaa147ce70bfe6ad8a37/gradio-client-1.8.0.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/873af77011d669e36c4deaa147ce70bfe6ad8a37/dist/lite.js""></script>

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
website	minor

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Move requirements generation in playground to playground worker

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